discussion summary practice problems frames Problems practice Elevator problem. Write something else. Write something different. Write something completely different. conceptual Is the frame of reference acceleration greater than, less than, or equal to normal earth gravity on the space shuttle as it… ascends to orbit orbits reenters the Earth’s atmosphere numerical NASA has two ground-based facilities for studying the effects ...

Read More »# dynamics i: force

## frames Practice

discussion summary practice problems frames Practice practice problem 1 Elevator problem. solution Answer it. practice problem 2 Write something else. solution Answer it. practice problem 3 Write something different. solution Answer it. practice problem 4 Write something completely different. solution Answer it.

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discussion summary practice problems frames Summary bullet

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discussion summary practice problems frames Discussion introduction Newtonian relativity: absolute linear motion at a constant velocity cannot be detected, nor can absolute rest. All motion is relative to a frame of reference. It is not possible to distinguish motion with a constant velocity from rest. All constant velocity frames of reference are equivalent (including frames of reference that appear to ...

Read More »## Centripetal Force Problems

discussion summary practice problems Centripetal Force Problems practice A 250 kg motorcycle is driven around a 12 meter tall vertical circular track at a constant speed of 11 m/s. Determine the normal and friction forces at the four points labeled in the diagram below. at the bottom (and rising) halfway to the top at the top 45° past the top Determine the ...

Read More »## Centripetal Force Practice

discussion summary practice problems Centripetal Force Practice practice problem 1 A 250 kg motorcycle is driven around a 12 meter tall vertical circular track at a constant speed of 11 m/s. Determine the normal and friction forces at the four points labeled in the diagram below. at the bottom (and rising) halfway to the top at the top 45° past the top ...

Read More »## Centripetal Force Summary

discussion summary practice problems Centripetal Force Summary Ways to accelerate A force that is… will make a moving object… or… parallel to velocity change speed (speed up) accelerate (in the usual sense of the word) antiparallel to velocity change speed (slow down) decelerate (which is just another way to accelerate) perpendicular to velocity change direction (turn) accelerate centripetally (which is also just another way to accelerate) A centripetal acceleration (ac) occurs whenever ...

Read More »## Centripetal Force Discussion

discussion summary practice problems Centripetal Force Discussion centripetal discussion ac = v2 r calculus [diagram of standard position circle] r ⇒ x = +r cos(ωt) y = +r sin(ωt) v = dr ⇒ vx = −rω sin(ωt) vy = +rω cos(ωt) dt a = dv ⇒ ax = −rω2 cos(ωt) ay = −rω2 sin(ωt) dt Check out the negative sign in the acceleration. This shows that acceleration is rotated 180° away from the ...

Read More »## Forces In Two Dimensions Problems

discussion summary practice problems Forces In Two Dimensions Problems practice A 55 kg human cannonball is shot out the mouth of a 4.5 m cannon with a speed of 18 m/s at an angle of 60°. (Friction and air resistance are negligible in this problem.) Determine… the acceleration of the human cannonball inside the cannon the components of her weight that are parallel ...

Read More »## Forces In Two Dimensions Practice

discussion summary practice problems Forces In Two Dimensions Practice practice problem 1 A 55 kg human cannonball is shot out the mouth of a 4.5 m cannon with a speed of 18 m/s at an angle of 60°. (Friction and air resistance are negligible in this problem.) Determine… the acceleration of the human cannonball inside the cannon the components of her weight that ...

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